The first item is a little (flash? java?) game where the player has to create a ‘gravitational field anomaly’ in order to accomplish some tasks, e.g., jumping, avoiding sharp gears, etc. Quite neat! 🙂

The second deals with category theory in geometry and physics… but it’s a public lecture that Urs has to give. So, it’s “category theory made easy”! Maybe this can make some things more palatable to some folks! 😉

The last item is just self-explanatory: I’ll just sit and rejoice on Amazon’s probably best move… ever! 😎

Well, in order to try to make life a bit simpler and add a bit of order to this chaotic world of blogging… i decided to start using categories (as WordPress calls them — tag is the name everyone else uses) based on the arXivs (as you can see in the posts below).

So, if you want, you can look for something like this… and, if more people start adopting this standard… maybe we’ll really be able to organize posts that deal with material from the arXivs in a comprehensive way. 😉